CousCousCirce: A captured unit is reborn on the rebirth square of
the capturing unit. If a pawn captures and promotes, the piece is reborn
on the rebirth square of the promoted piece. If a pawn is reborn on
the promotion rank, it's promoted. If the rebirth square is occupied,
the piece is removed from the board. Example game: 1. e4 h5 2. Qh5[+bPd1=bB]
Rh5[-]